 Company D was activated on 25 July 1968 in the regular army as Company D, 158th Aviation Battalion, an element of the 101st Airborne Division (airmobile), and activated at Fort Carson, Colorado.It was inactivated on 30 September 1981 at Fort Campbell, Kentucky, and relieved from assignment to the 101st Airborne Division (air assault), then redesignated on 16 September 1987 as Headquarters and Headquarters Company, 4th Battalion, 158th Aviation, relieved from allotment to the regular army, allotted to the army reserve, and activated at Fort Devens, Massachusetts (organic elements concurrently constituted and activated).It was inactivated there on 1 September 1996.